# Predictors of 30-day hospitalization in patients with worsening heart failure receiving outpatient intravenous diuretics

## TL;DR

This study identifies factors that predict hospitalization in heart failure patients treated with outpatient IV diuretics.

## Contribution

The study introduces a predictive model using clinical factors to guide treatment decisions for worsening heart failure.

## Key findings

- Age, eGFR, NT-proBNP, sodium, and haemoglobin predicted 30-day heart failure hospitalization.
- The model had an AUC of 0.73 in one hospital but performed less well in another with an AUC of 0.65.
- Higher NT-proBNP and diuretic dosages were linked to mortality and hospitalization at 6 months.

## Abstract

Outpatient intravenous (IV) diuretic treatment is an effective and safe strategy for worsening heart failure (WHF). Still, hospitalization cannot be avoided in a substantial portion of patients and potential predictors of HF hospitalization (HFH) are eagerly awaited.

We aimed to identify predictors of HFH after outpatient IV diuretic treatment for WHF, in order to improve the selection of patients who qualify for successful outpatient IV diuretic treatment.

We studied WHF patients receiving intravenous diuretics in an outpatient day-care setting in one of two Dutch hospitals. A total of 366 patients from hospital A were used to identify predictors of 30-day HF (re-)hospitalization (HFH), which occurred in 88 (24.0%). Mean age was 76 years, 57% were male and 49% had ejection fraction below 40%. Age, eGFR, NT-proBNP, sodium, and haemoglobin were identified as predictors of HFH. The multivariable logistic regression model containing these factors had acceptable calibration and discrimination (AUC 0.73). The performance of the model was less favorable in the 127 patients from hospital B (29 patients with 30-day HFH), with AUC 0.65 and suboptimal calibration, indicating overestimation of risk. Doubling of NT-proBNP plasma levels and higher ambulatory oral loop diuretic dosages were strong predictors of mortality and HFH at 6 months in hospital A.

In patients with WHF receiving outpatient day-care intravenous diuretic treatment, age, eGFR, NT-proBNP, sodium and haemoglobin predicted 30-day HFH. These factors may guide decisions on day-care treatment versus hospitalization, but require further validation Fig 2.